Exactly what are Jimmies? And, what is the difference between
sprinkles and Jimmies? Can Jimmies be colored, or are they only brown?
So basically I am asking what is the exact definition of a Jimmy, and
is the word used in the industy?

Thank you for your help :)

Since two well-known dictionaries give variations of the definition of
jimmies, I am posting this as a comment:

Merriam-Webster Online Dictionary

jimmies 
Pronunciation: 'ji-mEz
Function: noun plural
Etymology: origin unknown
: tiny rod-shaped bits of usually chocolate-flavored candy often
sprinkled on ice cream

http://www.m-w.com/dictionary/jimmies

=====================

The American Heritage Dictionary 

jimmies 
SYLLABICATION: jim·mies 
PLURAL NOUN: Small particles of chocolate or flavored candy sprinkled
on ice cream as a topping.
ETYMOLOGY: Origin unknown.  

http://www.bartleby.com/61/30/J0043000.html


These sites may interest you:

http://www.boston-online.com/glossary/jimmies.html

http://www.lanceandeskimo.com/journal/jimmies.shtml

http://www.barrypopik.com/article/521/sprinkles-for-jimmies


Please let me know if the above information suffices as an answer to your question.

Best regards,
Rainbow

GourmetSleuth.com provides a brief but in-depth summary of Jimmies:

http://www.gourmetsleuth.com/equivalents_substitutions.asp?index=J&tid=2204

According to "The Sleuth"  a fellow named Jimmie Bartholomew ran a
machine that made chocolate grains for Just Born Candy Company.  The
CEO gave him the honor of having the tasty morsels named for him.  It
doesn't look like my
hyperlink copied as a link but you should cut-and-paste it into your
browser and visit the site to read the whole story.

Calling sprinkles "jimmies" sounds as wrong as calling soda "pop".